Monolayer-based selective optical recognition and quantification of FeCl3 via electron transfer

Tarkeshwar Gupta, Milko van der Boom

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Reagentless optical recognition and parts-per-million (ppm) quantification of FeCl3 in CH3CN was demonstrated using a redox-active Os(II)-chromophore-based monolayer on glass. The Fe3+-induced oxidation of the monolayer is fully reversible and can be monitored optically with a conventional UV/vis spectrophotometer (260-800 nm). The system can be reset with water within 3 is not affected by the presence of representative alkali metals, alkaline earth metals, and other transition-metal salts. Sensing of Fe 3+ and concurrent generation of Fe2+ can be also observed with the naked eye by adding 2,2′-bipyridyl (bipy) to the solution to generate [Fe(bipy)3]2+. Validation of the analytical performance characteristics of the sensor was performed including reversibility, reproducibility, stability, and the detection range (0.5-162 ppm of FeCl 3 in CH3CN, 100-1000 ppm in water). The monolayer is sensitive and specifically responsive to its target ion. In addition, a blind test was conducted to probe the reproducibility and reproducibility variances of the system. The reaction of the monolayer with a CH3CN solution containing 5 ppm of FeCl3 follows pseudo first-order kinetics in the monolayer with ΔG‡298K = 21.6 ± 0.1 kcal/mol, ΔH = 10.2 ± 1.5 kcal/mol, ΔS‡ = -38.3 ± 4.9 eu.

Original languageEnglish
Pages (from-to)12296-12303
Number of pages8
JournalJournal of the American Chemical Society
Volume129
Issue number40
DOIs
Publication statusPublished - Oct 10 2007

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2,2'-Dipyridyl
Monolayers
Alkaline Earth Metals
Electrons
Alkali Metals
Water
Oxidation-Reduction
Glass
Salts
Metals
Ions
Ultraviolet spectrophotometers
Alkaline earth metals
Alkali metals
Chromophores
Transition metals
Oxidation
Kinetics
Sensors

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Monolayer-based selective optical recognition and quantification of FeCl3 via electron transfer. / Gupta, Tarkeshwar; van der Boom, Milko.

In: Journal of the American Chemical Society, Vol. 129, No. 40, 10.10.2007, p. 12296-12303.

Research output: Contribution to journalArticle

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